DE3145594A1 - MOVIE TRANSPORTATION - Google Patents

Description

3H559A

Lawyer file 31 907

description

The invention relates to a film transport circuit according to the Preamble of claim 1.

In Japanese Patent Application Laid-Open No. 121.524 / 74 is a film transport system for a camera bell, 0 written, in which a motor is operated, which then turns rotates at full speed to advance a film on completion of a shutter operation, while simultaneously formed in the film perforations at a predetermined location electrically sensed and by means of a Counter are counted so that when its counter reading reaches a predetermined value, the motor is switched off because the film is advanced by one frame. However, this system has the disadvantage that when a stop command is generated when the count reaches a predetermined value Value is reached, the motor continues to run, which then results in a film slip corresponding to a number of perforations as a result, whereby the accuracy when stopping the film at a given point deteriorates or is adversely affected. Even if there is no film in the camera to prevent perforations are felt in the film, once the motor is started upon completion of a shutter operation, the motor will remain in motion is switched on or excited, so that the camera can then not be operated or is not functional. Furthermore, since a power source is normally left on, it is undesirable and uneconomical Waste of energy if the film is not transported. In addition, a facility must be provided be? which the motor according to a frame movement of the film turns off, while the motor remains turned on or remains energized when a film transport has completely ended after the last frame of the film has been

has been conducted.

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.Θ.

To overcome this difficulty, a resistor can be connected in series with the motor to prevent the Determine the motor current that occurs when the transport stops after the full length of the film has been fed has been to thereby stop the energizing or switching on of the motor. The series connection of the resistor to the However, the engine has a loss or deterioration of the engine characteristics, such as the tightening torque or the speed-torque curve and can also an erroneous detection of a high current when starting the motor or a current flow as a result of a Result in fluctuations in the load, which in turn leads to an incorrect shutdown of the motor.

Although control according to the contents of a counter can be considered, accurate Control cannot be achieved because of a perforation

a single signal is generated.
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According to the invention, therefore, a film transport circuit is intended can be created with which the running speed of a film can be reduced before the film is in a Stop position comes. This then reduces film slippage, and the film can be positioned more precisely at the intended location being stopped.

Also in accordance with the invention is a film transport circuit created, in which a pseudo-perforation

signal is fed to a counter during film transport when any perforation of a film is not detected will. Thus, according to the invention, when the full length of the film has been fed and no longer one Perforation can be detected, a film is attached or

-wrapping carried out without the motor constantly turning turns. Further, according to the invention, there is provided a film transport circuit in which an uneconomical

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j Energy consumption and thus energy waste excluded is by turning off an energy source after the film has finished moving. In addition, according to the invention still managed a film transport circuit fen, which provides a safety measure in the event that over a predetermined time interval during film transport no perforations can be found in the film. This can be done through effective finding of the single image transport of an image

, «Which corresponds to the full number of frames in the film Length has been fed before a security measure is taken and takes place. In addition, is also provided a film transport circuit which generates a pair of pulses per perforation of the film; by using these impulses can then be controlled more precisely. According to the invention, this is the case with a film transport circuit achieved according to the preamble of claim 1 by the features in the characterizing part of claim 1. Advantageous further developments of the invention are set out in the subclaims specified.

In the following, the invention is based on preferred embodiments sformen with reference to the accompanying drawings explained in detail. Show it:

Fig. 1 is a circuit diagram of an embodiment of a conventional Film transport circuit;

Fig. 2 to 5 circuit diagrams of several embodiments according to the invention;

FIG. 6 is a timing diagram showing the sequence in the embodiment of FIG. 5; FIG.

7 shows a circuit of a further embodiment of the invention;

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3 and 9 are timing diagrams in which the operation of the

is shown in Fig. 7 reproduced embodiment;

10 to 12 circuits of further embodiments of the Invention and

Fig. 13 shows part of a circuit of still another embodiment of the invention.

In Fig. 1 is an embodiment of a conventional film port Sports circuit shown which is used in a camera can be. The arrangement has a perforation sensing circuit 1 with a light-emitting diode LED, a photodiode PD, operational amplifiers 0P1 and 0P2, one variable resistor VR1 and resistors R1 bis R4 on. Furthermore, the arrangement has a shutter control circuit 2 with a photometric element CDS, a Capacitor C1, a trigger switch SW1, a variable Resistor VR2, an operational amplifier 0P3 and an electromagnet SMg for the shutter. aside from that a counter and control circuit 3 has a counter CNT, an RS flip-flop JFF1, capacitors C2 and C3, a diode D1, resistors R5 and R6 and an OR circuit 0R1.

A motor control and braking circuit 4 comprises a pair of buffers A1 and A2, resistors R7 and R8, and transistors Tr1 and Tr2. For example, a film drive motor M may be connected to a film take-up spool; also are a

Film F and a supply voltage Vb are shown. 30th

When the supply voltage is switched on, a Reset circuit, the capacitor C2, the resistor R5 and ■ the diode D1, first a pulse, which is let through by the OR circuit 0R1 ^ 5 and resets the flip-flop FF1. Hence the The transistor Tr1 is turned on while the transistor Tr2 is turned off, so that the motor M remains inoperative.

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When a release switch of an associated camera is turned on, the shutter drive circuit 2 is turned on. Then the flip-flop FF1 is set upon completion of a shutter operation. Especially if a mechanical trigger is actuated to activate the trigger switch SWI to open, the capacitor C1 begins to charge through the photometric element CDS. At this time the output of the operational amplifier 0P3 remains at its low level and hence the solenoid becomes SMg of the breech kept energized =

When the voltage across the capacitor C1 reaches a value which is equal to a preset voltage or a divided voltage of constant magnitude, which is associated with a shiftable tap of the variable resistor VR2 is set, the output of the operational amplifier is reversed OP 3 returns to its high level, whereupon the electromagnet SMg of the shutter is de-energized. The exit of the operational amplifier 0P3 is then formed by a capacitor C3 and resistor R6 Differentiator differentiated and to the set input of the Flip-flops FF1 applied. The flip-flop FF1 is set upon completion of a shutter operation in accordance with the rising edge of the output of the operational amplifier 0P3.

As a result, the transistor Tr1 is turned off while the transistor Tr2 is turned on, which then turns the motor M starts rotating so that the film F loaded in the camera can be fed. Simultaneously the counter CNT is enabled by the inverting output of the flip-flop FF1, which is connected to its clear input has been applied, thereby reversing its lower level. Consequently, the light-emitting Diode LED and the Photoediode PD, which are arranged at a predetermined location, ready for operation to a

Determine perforation or perforations in the film F to be transported. Such a sensing signal is then through the op amps 0P1 and 0P2 as a

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Perforation signal supplied, which is counted by the counter CNT.

For example, if the film F is the full length and thus has eight perforations per frame, the Counter CNT outputs an output signal after counting eight perforation signals. This output signal is then passed through the OR circuit OR1 to reset the flip-flop FF1. In this way, the transistor Tr2 turned off to turn off the motor M, and at the same time the transistor Tr1 is turned on to have a braking effect to exercise on the motor M, which then der'Feitertransport of the film F is finished after it has been fed over a distance corresponding to one frame

! i> has been.

In the film transport circuit described above, the motor M rotates after completion of a shutter operation at full speed until the perforation sensing circuit 1 detects eight perforations, which is an image field of the film. When a stop signal is generated after the eight perforations have been detected, the motor To switch off M, the motor rotates due to its coasting down even further, even if the braking force has already been applied

² ^, which is why the stop position of the film F is not particularly accurate. ^K

In the embodiment according to the invention shown in FIGS. 2 and 3, the arrangement is designed so that

the running speed of the film is slowed down before the stop position is reached / by temporarily interrupting or limiting the energy supplied to the motor will; as a result, a higher accuracy with regard to the stop position of the film can be achieved.

In the embodiment of Fig.2 is a chopper 5, the an AND circuit AND1, a NAND circuit NAND 1 and

Includes \ an oscillator OSC1, between, the flip-flop FF1 and the buffer A1 and A2 connected, both in the Filmtransportschaltungder FIG. 1 Video- A second and a third bit output, the outputs of numerals "2" and "4" from the counter CNT are applied to the NAND circuit NAND1, which also receives a pulse from the oscillator OSC1. The output of the NAND circuit NAND 1 remains at its high level until the counter CNT one after the completion of a shutter operation

IQ count of 6 reached. During this time interval if the output of the flip-flop FF1 is passed through the AND circuit AND1 and fed to the buffers A1 and A2, see above that the motor M can rotate at full speed. During the time interval during which the counter CNT a Counts from 6 to 8, the pulse from the oscillator ÖSC1 is inverted by the NAND circuit NAND1, where- the output from the flip-flop FF1 through the AND circuit AND1 is interrupted intermittently; thereby a chopped control of the motor M is achieved, whereby the running speed of the film F is decreased. If the counter CNT the count of 8 assuming reaches that the running speed of the film F has been reduced, the flip-flop FF1 is reset, whereby the transistor Tr2 is turned off, and the energization of the motor M is interrupted. At the same time, the transistor Tr1 is turned on to an electromagnetic To exert a braking action on the motor M so that the film F can then be stopped with a high accuracy.

in Fig. 3 is another embodiment of the invention shown, in which a temporary stop circuit which AND circuits AND2 and AND3 and a monostable Circuit MM has, between the flip-flop FF1 and the buffers A1 and A2 are connected, which are both in the Filmtränsport circuit of Fig. 1 are provided. A first, a second and a third bit output, the digits "1", "2" and "4" from the counter CNT are sent to the

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AND circuit AND2 applied so that at the time when the counter CNT reaches a count of 7 after the closure of a shutter, the output of the flip-flop FF1 is passed through the AND circuit AND3 and consequently through the buffers A1 and A2, so that the motor M can rotate at full speed. However, when a count of 7 is reached, the AND circuit generates AND2 a high output, causing its rising edge the monostable circuit MM triggers; the inverted output of the monostable circuit MM is on a brought low level, thereby preventing the output of the flip-flop FF1 through the AND circuit AND3 is let through. In this way, the excitation of the motor M is interrupted and, at the same time, a braking effect is applied exerted on the motor M.

The inverted output of the monostable circuit MM returns to its high level before the counter CNT one Count of 8 reached, whereby the AND circuit AND3 is enabled again to excite the motor M again. When the counter CNT reaches a count of 8, the excitation of the motor M is interrupted and it is again a braking effect exerted on the motor M. However, since the engine M as a result of restarting at a lower Speed is running, the film F can be stopped with a high accuracy.

In the film transport circuit of Fig. 1, when a release switch is depressed when the film F is positioned so that its perforation cannot be felt, the flip-flop FF1 is activated according to the rising edge of the output of the shutter drive circuit 2 upon completion of a Lock actuation set so that the motor M can start again. However, since the perforation sensing circuit 1 cannot generate a perforation signal, the counter CNT cannot continue counting, and consequently the motor M continues to rotate.

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For safety reasons, a device can be provided which prevents the release of the shutter, the excitation of the The motor cuts out or the power supply is switched off in the event that the camera is not loaded with film and it is not at the pickup site (which is adjacent to where the perforation is felt). If such a device is provided, assuming that no film is loaded, every camera operation such as a film winding prevented. In Fig. 4 is another embodiment of the invention in which a pseudo-perforation signal is given to the counter in the event that there is no film is present, thereby effectively preventing further rotation of the motor and actuation of the camera in the same way as if the film were present.

In the embodiment of Figure 4, one is a pseudo-perforation signal output circuit 7 between the perforation sensing circuit 1 and the counter CNT in FIG shown film transport circuit switched. The circuit 7 indicates the presence / absence of the film Detecting switch SW2, AND circuits AND4 and AND5, an OR circuit OR2, an inverter N1, an oscillator 0SC2 and a resistor R9. When the film is in a take-up position in the transport path, which is adjacent to the point at which a perforation is felt, the switch SW2 is closed, whereby then the inverter N1 has an output with a high

Level outputs to enable the AND circuit AND4, thereby removing the perforation signal from the perforation sensing circuit 1 is passed through this logic element and the OR element 0R2 and fed to the counter CNT, so that film transport is possible in the manner described above is.

When the film is in a take-up position in the transport path

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, is not present ^ (which is adjacent to the point at which a perforation is felt) _t the switch SW2 is open. Instead, a pulse from the oscillator OSC2 is applied as a pseudo-perforation signal to the AND circuit, which is then enabled, and via the OR

Circuit 0R2 fed to the counter CNT. The motor M stops when the counter CNT reaches a count of 8, when the flip-flop FFl corresponding to the rising edge of a Output from the shutter drive circuit 2 is set

_in is. When a shutter is cocked by rotating a reel, the oscillator OSC2 only needs to generate eight pulses during a time interval during which the reel is in rotation. Thus, the oscillator OSC2 can emit pulses corresponding to the rotation of a coil or

■ ^ 5 can run freely. When using a self excited oscillator a frequency is chosen at which eight pulses are generated during the maximum time required for a shutter cocking is required.

■ 20 In Fig. 5 yet another embodiment of the invention is shown in which the power supply after
at the end of a film transport * is switched off in order to avoid unnecessary waste of energy. The timing of this process is shown by a timing diagram in FIG. In Fig. 5 is
a power supply in the form of a battery B is shown and the film transport circuit of Fig. 1 is in
a block labeled FIG1. The main line to which the supply voltage Vb is applied

is via one formed by a switch Tr3
Switch connected to the energy source B. The arrangement has transistors Tr3 to Tr5, capacitors C4 and C5,
a trigger switch SW3, an OR circuit OR3, a
AND circuit AND6, an inverter N2, a trip electromagnet RMg, diodes D2 and D3, and resistors R10 to R15, which are connected as shown.

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When the trigger switch SW3 is turned on, it starts to charge the capacitor C4 via the diode D2 = at the same time becomes the transistor Tr4 as well as the transistor Tr3 turned on, whereby the voltage Vb from the main line of the circuit FIG1 of FIG is created. In the circuit FIG1 of FIG. 1, when the voltage Vb is applied, the reset circuit generates the Capacitor C2, resistor R5 and diode D1, a pulse,.: By which the flip-flop FF1 is reset

-.Q will. An inverted output Q of the flip-flop FF1 becomes applied to the AND circuit AND5 together with the voltage supplied through the trigger switch SW3. Since both inputs are high, a high output is produced. Hence the 5 transistor Tr5 is switched on, whereby the electromagnet RMg is energized and consequently a mechanical release is initiated will. With the circuit FIG1 of FIG. 1, the shutter control circuit 2 thus operates in the manner described above Way.

Upon completion of a shutter operation, the flip-flop FF1 is set, whereby the motor M is rotated and the film F is fed. At the same time the counter CNT is released and counts a perforation signal, which generated by the perforation sensing circuit 1 when a perforation is made in the film F at a predetermined location is felt. When the counter CNT reaches a count of 8, it generates an output signal by which the Flip-flops FF1 is reset, which then interrupts the excitation of the motor M and at the same time has a braking effect is exerted on the motor M. In this way, the film F is transported over a distance that is one frame or corresponds to an image field. If the release switch SW3 remains on, after the film F is turned on a Image corresponding route further ^ _, has been transported is, - becomes a further mechanical one by the electromagnet RMg Triggering carried out. In this way, the

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Trigger switch SW3 be pressed continuously and it can continuously photographed.

A non-inverting output Q of the flip-flop FF1 is applied to the OR circuit 0R3, which via the inverter N2 a. Output S "is obtained from the shutter drive circuit 2. If the release switch S3 is turned off at the time when the film F has been transported over a distance corresponding to one frame, the output Q of the flip-flop FFI assumes a low level during the The output of the shutter drive circuit 2 assumes a high level, whereby the output of the OR circuit OR3 assumes a low level. As a result, the capacitor C 4 discharges through the resistor R10. During such a time interval, the supply voltage Vb is continuously applied to the circuit FIG1 of FIG 1, so that consequently an electromagnetic braking effect is exerted on the motor M. When the capacitor CA is completely discharged, the transistors Tr4 and Tr3 are switched off, whereby the power supply for the circuit FIG1 of Fig. 1 is cut off until the trigger switch SW3 is switched on the next time, this way the camera is ready for another release riding, although an idle current is excluded.

In a further embodiment of the invention, the absence of a perforation signal during a predetermined Time interval determined during a film transport to interrupt the excitation of the motor or to the

Reset the control circuit to its initial state. In Fig. 7 is an embodiment of the »invention is shown, which is similar to the film transport circuit shown in Fig. 1, but with a circuit 6 for safety is provided to determine the end of the film transport.

len when its full length is fed. The circuit 8 has capacitors C6 and C7, transistors Tr6 and Tr7, a constant current circuit I, an operational amplifier

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ker 0P4 and resistors Rl6 and R17.

The output Q of the flip-flop PF1 is used as a clear signal the counter CNT and also applied to the base of the transistor Tr7. As a result, the transistor Tr7 is turned on, so that the capacitor C7 will be charged by the constant current circuit I during the film transport can. Furthermore, a perforation signal from the operational amplifier OP2 is passed through one of the capacitor and the widefstand R16 differentiated differentiated circuit formed, and applied to the base of the transistor Tr6, which then is turned on by the rising edge of the perforation signal, whereby the capacitor C7 is cleared or is discharged. The potential at a node A or the voltage at the capacitor C7 is determined by an operational amplifier 0P4 compared with a reference voltage ref. Thus, if the film F is properly fed, it will Perforation signal generated periodically as shown in Fig. 8 to clear the capacitor C7 so that the

^ O potential at circuit point A below the reference voltage ref remains, which leaves the output of operational amplifier 0P4 at its low level. If the total length of the film F, which corresponds to all image fields, has been transported and the film F comes to a stop, the perforation signal is no longer output from the perforation sensing circuit 1, as shown in FIG is, and consequently the capacitor C7 cannot be reset, so that the potential at the node A increases. If the perforation signal occurs during a previous

given time interval is missing, the potential at node A reaches the reference voltage ref, whereupon the The output of the operational amplifier 0P4 changes to its high level, which is applied through the OR circuit 0R1 to reset the flip-flop FF1. In this way

the control circuit returns to its initial state, and the excitation of the motor M is stopped.

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In Fig. 10 an embodiment is shown which corresponds essentially to the film transport circuit of Fig. 2, in which, however, a counter CNT can count up to 16 before emitting an output signal, and in which one Circuit 9 is provided which generates a pulse to an area between the perforation and a film part at the perforations formed in the film F

The circuit 9 has an inverter N3, capacitors C8 and C9, resistors R18 and R19, buffers A3 and A4 and an OR circuit OR4. In the circuit 9, the perforation signal from the perforation sensing circuit 1 by one formed from the capacitor C8 and the resistor R18 Differentiating circuit differentiates, and the resulting pulse is via the buffer A3 of the OR circuit 0R4 and is also inverted by the inverter N3 before being replaced by one of the capacitor C9 and the Differentiating circuit formed by resistor R19; the resulting pulse is over the buffer A4 is supplied to the OR circuit OR4. As a result, an output pulse through the OR circuit OR4 becomes a transition between a perforation and an adjacent area which is defined between two adjacent perforations is, or generated as a transition between such an area and a further perforation of the film, which over the ^ Point is running to which the light emitting diode LED and the photodiode PD are aligned. In other words, there will be a pair of impulses on the leading and trailing edges a perforation generated. The output pulses from the OR circuit OR4 are counted by the counter CNT, and if so

whose count reaches 16, the counter CNT emits an output signal which resets the flip-flopsFFi, whereby film transport is terminated in the same way as before.

In the chopper circuit 5, a third and a fourth bit output, which digits "4" and "8" of the Counter CNT, to the NAND circuit NAND1

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·, Placed, which also receives an impulse from the oscillation gate OSC1. Until the counter CNT reaches a count of 12 after the completion of a shutter operation, the output of the NAND circuit NAND1 remains at a high level, so that the output of the flip-flop FF1 via the AND circuit AND1 and then via the buffers A1 and A2 is supplied so that the motor M can rotate at full speed. During the time interval during which the counter CNT counts from 12 to 16, the pulse from the oscillator _n OSC1 is inverted by the NAND circuit NAND1, whereby the output of the flip-flop FF1 is intermittently applied via the AND circuit AND1, see above that in this way a chopped control of the motor M is achieved. In this way, the running speed of the film F is decreased.

When the counter CNT provided that the film F runs at a lower speed, reaches a count of 16, the flip-flop FF1 is reset, so that the transistor Tr2 is turned off, whereby then the excitation of the motor M is interrupted and at the same time the transistor Tr1 is turned on to an electromagnetic To apply a braking action to the motor M so that the film F is then stopped with a high accuracy can.

In Fig. 11 is another embodiment of the invention which corresponds generally to the transport circuit shown in FIG. 10, but which is a temporary stop circuit 6, the AND circuits AND2 and AND3 and a one-shot circuit MM and is connected between the flip-flop FF1 and the buffers A1 and A2. A second, a third, and a fourth Bit output corresponding to the digits "2", "4" and "8" from the counter CNT are applied to the AND circuits AND2, so that during the time during which the counter CNT after completion of a shutter operation Count of 14 reached, the output of the flip-flop FF1 via the AND circuit AND3 and the buffers A1 and A2 to-

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j is performed so that the motor M runs at full speed can turn. When the counter CNT reaches a count of, the output of the AND circuit AND2 goes to its . high level above, and its rising edge triggers the monostable circuit MM, whose output is then on a changes low level to disable the AND circuit AND3, so that it is then prevented that the output of the flip-flop FF1 is allowed through.

0 As a result, the excitation of the motor M is then interrupted, and a braking effect is exerted on the motor M at the same time. However, the output Q reverses the monostable Circuit MM returns to its high level before the counter CNT reaches a count of 16, whereby the AND circuit AND3 is released again in order to feed it to the motor M '. If the counter CNT has a count of 16 reached, the excitation of the motor M is interrupted and a braking effect on the motor M is exerted. There the engine is rotating at a lower speed as a result of restarting, the film F can be made with a good or with high accuracy.

A further embodiment of the invention is shown in FIG "which generally corresponds to the embodiment of FIG. 10, but in which the chopper circuit is omitted and which has the circuit 8 previously described in connection with FIG. 7 for this purpose, with which it can be determined that the full length of the film has been transported. Compared with the embodiment 7, the circuit 8 is arranged to have a shortened period for the input pulses has, whereby the accuracy in the detection is improved. Since the output pulse of the OR circuit OR4 has a shorter duration, the capacitor C6 and the Resistor R16 can be omitted.

As shown in Fig. 13, the circuit 9 may be a

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1 resistor R20, a capacitor C10 and one exclusive Have OR circuit EO. In this case, the perforation signal from the perforation sensing circuit becomes immediate to the exclusive OR circuit EO after a

5 time delay applied, which is determined by the resistor R20 and the capacitor C10, so that the exclusive OR circuit EO can generate a pulse similar to the output pulse from OR circuit OR4.

10 End of description

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Claims (15)

Patent to sayings Film transport circuit with a motor to move a film in a camera by one upon completion of a shutter operation to transport a route corresponding to a picture, mark Inet by a perforation sensing circuit (1) through which a perforation in the to be transported Film (F) is felt at a given point and a perforation signal is generated by a counter (CNT) for counting the perforation signals, by a first device, which is responsive to the end of a shutter actuation to drive the motor (M) until a count in the counter (CNT) reaches a first predetermined value, and by a control device for performing a predetermined value Control during the fiom transport. 2. Film transport circuit according to Claim 1, characterized in that that the control device lowers the speed of the motor after the count reaches a second predetermined value in the counter (CNT), which is smaller than the first value. VII / XX / Ktζ ■ S (089) 93 82 72 988273 988274 983310 Telegrams: BERGSTAPFPATLST Munich TELEX: 05245Wl BFRG d Bank accounts Hypo-Bank Münc ¹ cn 44101728W (BL /. 7 (1020011) Swifl Code '.Yl ¹ O OI MM Bayer Vcrcinshank Munich 4531 (K) (Hl 7 7W) 202 70) Postscheck Munich 65343-WI8 (M / 3. Film transport circuit according to claim 2, g e k e η η-records by a chopper (5), which intermittently interrupts the activation of the motor (M), after the count in the counter (CNT) has reached the second value, thereby increasing the speed of the motor (M) to humiliate. 4. film transport circuit according to claim 2, g e ken nz e i c h η et by a temporary stop circuit (6) to control the motor (M) for a given Interrupt time interval when the count in the counter (CNT) reaches the second value, so as to Reduce the speed of the motor. ! 5 5. Film transport circuit according to claim 1, thereby identified ze rejects that the controller a Sends pseudo-perforation signal to the counter (CNT) in the event that the perforation sensing circuit (1) fails, to generate the perforation signal in the absence of the film (F). 6. film transport circuit according to claim 5, characterized in that that the perforation sensing circuit (7) a switch (SW2) to stop the perforation ■ ^ To detect the signal in the absence of the film (F), a pulse oscillator (0SC2) and a device (AND2), around the pulse generated by the oscillator (OSC2) in the absence of the film according to the detection of the failure of the perforation signal by the switch (SW3) to put on. 7. film transport circuit according to claim 1, characterized in that that the control device turns on the power to the circuit (FIG1) when a film transport is started and the power is switched off when film transport is finished. 8. Film transport circuit according to claim 7, g e k e η η-records by a switch for switching the energy on and off and by a device for switching on the Switch corresponding to the closing of a shutter release switch and to turn off the switch after the motor (M) has stopped. 9. film transport circuit according to claim 1, characterized g ekennz calibrates that the control device effects a safety measure if it fails to use the perforation signal during a predetermined time interval during film transport. 10, film transport circuit according to claim 9, g e k e η n marked by a circuit (8) activated by a signal from the first device during film transport is made effective to stop the motor (M) as soon as the perforation signal from the perforation sensing circuit fails (1) is determined during a predetermined time interval. 11. film transport circuit according to claim 1, characterized g ekennze The controller senses an area of the film that is between the perforation and a film part is set between adjacent perforations, whereupon a pair of pulses is generated per perforation will. 12. Film transport circuit according to claim 11, g e k e η η-records by a circuit (9) which generates pulses corresponding to the leading and trailing edges of the perforation signal from the perforation sensing circuit (1) and apply it to the counter (CNT). 13. Film transport circuit according to claim 12, characterized by a chopper (9) to interrupt the control of the motor (M) intermittently after 314559A the count in the counter (CNT) is a predetermined one Value reached in order to then reduce the speed of the motor (M). 14. Film transport circuit according to claim 12, characterized by a temporary stop circuit (6) to stop the control on the motor (M) for a given Interrupt the time interval when the count in the counter (CNT) reaches the specified value. 15. Film transport circuit according to claim 12, characterized by a circuit (8) activated by a signal from the first device during film transport is made ready to stop the motor when this is indicated by the perforation sensing circuit (1) supplied perforation signal · missing during a given time interval.